<html>
<head>
  <meta charset="utf-8">
  <title>123</title>
  <style type="text/css">
  boty{
    padding:0;
    margin:0;
   }
   p{
    color：red
     font-size:99px;
     }
</style>
</head>
</boty>
<p>我要把边框消除</p>
<p>我要把边框消除1</p>
<p>我要把边框消除2</p>
<div>这是div里面的内容</div>
</body>
</html>